chore: bump Pi to 0.40.0 and revert PR #454 pi-ai patch

- Upgrade @mariozechner/pi-* packages from 0.38.0 to 0.40.0
- Remove pi-ai patch (upstream 429 fix in 0.40.0 supersedes PR #454)
- Update CHANGELOG

package.json

@@ -97,10 +97,10 @@
     "@grammyjs/runner": "^2.0.3",
     "@grammyjs/transformer-throttler": "^1.2.1",
     "@homebridge/ciao": "^1.3.4",
-    "@mariozechner/pi-agent-core": "^0.38.0",
-    "@mariozechner/pi-ai": "^0.38.0",
-    "@mariozechner/pi-coding-agent": "^0.38.0",
-    "@mariozechner/pi-tui": "^0.38.0",
+    "@mariozechner/pi-agent-core": "^0.40.0",
+    "@mariozechner/pi-ai": "^0.40.0",
+    "@mariozechner/pi-coding-agent": "^0.40.0",
+    "@mariozechner/pi-tui": "^0.40.0",
     "@sinclair/typebox": "0.34.47",
     "@slack/bolt": "^4.6.0",
     "@slack/web-api": "^7.13.0",
@@ -165,7 +165,6 @@
       "@sinclair/typebox": "0.34.47"
     },
     "patchedDependencies": {
-      "@mariozechner/pi-ai": "patches/@mariozechner__pi-ai.patch",
       "@mariozechner/pi-agent-core": "patches/@mariozechner__pi-agent-core.patch"
     }
   },
@@ -202,7 +201,6 @@
     ]
   },
   "patchedDependencies": {
-    "@mariozechner/pi-ai": "patches/@mariozechner__pi-ai.patch",
     "@mariozechner/pi-agent-core": "patches/@mariozechner__pi-agent-core.patch",
     "@mariozechner/pi-coding-agent": "patches/@mariozechner__pi-coding-agent.patch",
     "qrcode-terminal": "patches/qrcode-terminal.patch",